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The collaboration aims to provide women a sustainable solution to their menstrual periods and a percentage of the sales of the special edition "261 Fearless cups" will benefit the global non-profit organisation to further its mission of empowering women globally through running.

261 Fearless founder and 1974 NYC Marathon winner Kathrine Switzer said it was "appropriate" they would be launching the partnership at a running event that featured more than 20,000 women.

"Everyone is nervous on race morning, but few are as nervous as those 3000 or so women who are also having their periods.

"While we're hoping to help that situation, our partnership with Hello Cup is much broader than a race; it's about women everywhere, especially those who are missing valuable days of school, work and social engagement.

"Often they are poor and cannot afford the monthly expense of sanitary products. 261 Fearless hopes to equip these disadvantaged girls and women with basic feminine humanitarian needs so they can engage and flourish. "

Hello Cup has become a global Kiwi success story since its inception late last year, but McLean and Bond said the opportunity to work with Kathrine and the 261 had been a highlight.

"We're thrilled to be helping solve a conundrum female athletes have experienced for decades, as well as reaching out to women around the world. We want women to be empowered and educated about both their bodies and their options – and we're so grateful for this opportunity to broadcast our message with 261 Fearless."

The limited edition 261 Fearless Hello Cup will be on sale at the New York Marathon Expo from November 1 - 3, 2018 and on the Hello Cup website from November 1.